diff --git a/runtime/syntax/testdir/input/c.c b/runtime/syntax/testdir/input/c.c
index ede2caf..595721b 100644
--- a/runtime/syntax/testdir/input/c.c
+++ b/runtime/syntax/testdir/input/c.c
@@ -1,5 +1,5 @@
 /* vi:set ts=8 sts=4 sw=4 noet:
- * TEST_SETUP let g:c_comment_strings = 1
+ * VIM_TEST_SETUP let g:c_comment_strings = 1
  *
  * VIM - Vi IMproved	by Bram Moolenaar
  *